Heartburn: Heartburn occurs when stomach acid backs up into your esophagus. If the lower esophageal sphincter relaxes abnormally or weakens, stomach acid can flow back up into your esophagus, causing heartburn. The acid backup may be worse when you're bent over or lying down.
Answered 5/28/2017
5.2k views
Uncertain: Heartburn occurs when acid from the stomach refluxes or splashes up into the esophagus (and sometimes the mouth or throat).
Answered 5/28/2017
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A doctor has provided 1 answer
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3 doctors weighed in across 2 answers
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